II. To estimate the major response rate (complete and partial responses by the IWG response criteria) to a 10-day regimen of azacitidine and to the same regimen of azacitidine in combination with entinostat administered orally on days 3 and 10 of each cycle in patients with de novo myelodysplastic syndromes (MDS), chronic myelomonocytic leukemia (CMMoL) (dysplastic) and acute myeloid leukemia with trilineage dysplasia (AML-TLD), as well as in patients with treatment-induced MDS, CMMoL (dysplastic) and AML-TLD.